Changes

• Kotlin 1.5.21

• Support macOS, watchOS, tvOS

cf. https://github.com/AAkira/Napier/releases/tag/2.0.0-alpha2

• Run on other threads on Kotlin/Native

cf. https://github.com/AAkira/Napier/releases/tag/2.0.0-alpha1

• [Experimental] Support IR Compiler

Help!

I want to support Linux and mingw.
But I have no idea getting a backtrace on theirs.
Please send PR if you have an idea.
You can work this library on Linux on linux branch.